pub fn assert(v: any, message: option<string>) -> Repeatable<any>Expand description
Raises an error if the value of its argument v is false (i.e. nil
or false); otherwise, returns all its arguments. On error, message
is used as the error object; when absent, it defaults to
"assertion failed!".
local f = assert(io.open("config.txt")) -- error if the open failed